DATACMNS-400 - PersistentProperty now exposes findAnnotation(…).

Pulled up the method declaration from AnnotationBasedProperty as it's useful to be able to inspect a property for annotations being configured on it independently from whether the persistent mapping of it has been defined via annotations or not.

Expose isAnnotationPresent(…) as well to ease quick checks for an annotation.

src/test/java/org/springframework/data/mapping/model/AbstractPersistentPropertyUnitTests.java

@@ -22,6 +22,7 @@ import java.beans.BeanInfo;
 import java.beans.IntrospectionException;
 import java.beans.Introspector;
 import java.beans.PropertyDescriptor;
+import java.lang.annotation.Annotation;
 import java.lang.reflect.Field;
 import java.util.Collection;
 import java.util.Map;
@@ -326,6 +327,16 @@ public class AbstractPersistentPropertyUnitTests {
 		protected Association<SamplePersistentProperty> createAssociation() {
 			return null;
 		}
+
+		@Override
+		public <A extends Annotation> A findAnnotation(Class<A> annotationType) {
+			return null;
+		}
+
+		@Override
+		public boolean isAnnotationPresent(Class<? extends Annotation> annotationType) {
+			return false;
+		}
 	}
 
 	static class Sample {